1433 is a default port number which is used by a Default Instance of SQL
Server. However, Named Instances use Dynamic Ports instead of a Static Port
by default. After installing Named Instances, I personally set a Static Port
for each of them and create rules in Windows Firewall accordingly.

To see which ports are being used by your SQL Server instances or change
their port configuration, you can use SQL Server Configuration Manager
(Start\Programs\Microsoft SQL Server 2008\Configuration Tools->SQL Server
Network Configuration)

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Ekrem Önsoy

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